Description Level 1 Chassis Stiffening Kit 63-66 Plymouth A-Body This kit Fits the 1963-1966 Valiant, Barracuda A-Bodies. Each Chassis Stiffening kit includes: A Pair of Frame Connectors A set of four Hot Rod Torque boxes Purchasing these chassis stiffening components as a kit will save substantially over purchasing these individually. For more A Body Chassis Stiffeners, visit this page.